- 
    Bug 
- 
    Resolution: Unresolved
- 
    P3: Somewhat important 
- 
    None
- 
    5.9.0
- 
    Windows 10 x64
 
 MinGW (bundled with 5.9.0 installer)
A video showing the example is attached.
This happens for all "padding.{left|right|top|bottom}" on any control that has it listed (that I've seen and tried).